Distributing brush for coating machines



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l3' Sheets-She L. B. CASE Original Filed June 1l DISTRIBUTING BRUSH FOR COATING MACHINES Oct. 13, 1931. B. CASE DISTRIBUTING BH'USH FOR COTING MACHINES 3 Sheets-Sheet 2 -i km@ Original Filed June ll,

Oct. 13, 1931. l.. B. CASE 1,827,641

DISTRIBUTING BRUSH FOR COATING MACHINES Original Filed June ll, 1926 3 Sheets-Sheet 5 Patented ct. 13, 1931 UNITED STATES PATENT OFFICE LYNN IB. CASE, OF N'EW BRUNSWICK, NEW JERSEY, ASSIGNOR T0 JOHN WALDRON COR- PORATION, OF NEW BRUNSWICK, NEW JERSEY, A CORPORATION OF NEW JERSEY DSTRIBUTIN G BRUSH FOR (')OATIN'Gr MACHINES `Original application iled J'une 1l, 1926,

This application is a division of application Serial No. 115,398, filed June 11, 1926.

The principal object of my invention is to provide an improved machine for coating web materials, including various papers and kfabrics where it is desired to treat the surface thereof, forthe purpose of filling the pores of the material and for various other reasons well known to those familiar with the art.

One object of my invention is to provide Yan improved coating table over which the material passes, the table being ofarcuate form, on which the material being coated is maintained in a taut and even condition, thereby preventing wrinkles in the material while undergoing treatment.

An improved feature of the invention is the provision of a suitable rubber apron for carrying the material to be coated over the coating table.

Another object of the invention is to provide a series of batteries of vibrating brushes, for distributing the coating material over the surface of the web undergoing treatment; and means for operating each brush which will insure full contact of each brush with the web, throughout the entire reciprocation thereof. i Another improved feature of the invention is the means for causing the material being coated to travel over the coating table, and includes a vacuum or suction box co-operating with a perforated belt.. which engages the web material, causing it to adhere to the per forated belt while passing over the vacuum box, the perforated belt being operatively and synchronously connected to the conveying apron, which is driven at its delivery end from a suitable source of power.

Another object of the invention is to provide a suitable device for applying the coating material to the web material and driving the color applying apparatus by means of v the conveying apron, from its recelving end.

Improved means is also provided for controlling the amount'of braking friction on the roll of stock in order to maintain the -proper amount oftension on the web material 'as it passes through the coating machine.

I also provide improved means by which Serial No. 115,398. Divided and this application led December 13,

1928. Serial No. 325,762.

the stock to be coated may be quickly and eiiiciently threaded through the machine, in-

cluding means for lowering the Acoating table out of contact with the vibrating brushes whereby the operator may conveniently thread the web material therebetween.

Another feature of the invention is to provide chilled iron rolls over which the web material passes, at the point where the coat ing material is applied thereto, the purpose of the chilled rolls being to prevent or reduce eroding of the rolls by the action of coating material, which in many instances is of a gritty nature.

Other objects and details of construction of the invention will be more fully disclosed hereinafter, reference being had tothe accompanying drawings, of which:

Fig. 1 is a side elevation of my improved coating machine;

Fig. 2 is a longitudinal sectional elevation of one end of the machine, drawn on somewhat of an enlarged scale;

Fig. 3 is a transverse sectional elevation taken along the line 3-3 of Fig. l; and

Fig. 4 is a longitudinal sectional elevation of the suction box, and 'its co-operating perforated belt forming a detail of the invention. Y

Referring to Fig. 1 of the drawings, one of the side frames of the machine is illustrated at l, it being understood that a similar frame 1a is located at the opposite side of the machine for providing a suitable support for the elements of the machine.

The web material to be coated is placed upon the machine in the form of a roll being rotatably mounted on the side frames, and placed under the control of braking mechanism hereinafter more fully described, and whereby the rotation of the roll is retarded. The material passes from the roll in the form of a web w1 under a guide roll 2 rotatably mounted on the side frames 1, la to and over a second guide roll 3,also rotatably mounted on the side frames, thereafter passing under a guide roll 4 rotatably mounted in bearings 5, 5, which are adjustably mounted on the side frames 1, 1. The web w1 passes over a guide roll 6 rotatably mounted 11 secured to the side frames 1 and 1a of the machine.

Parallel to and adjacent the roll 7 is a hollow or pipe roll 12 which is provided with trunnions 13 and 14 rotatably mounted in the bearings 10 and 11 respectively. The roll 12 supports one end of an apron 15 which may be composed of rubber or other suitable material, the opposite end of which passes around and is supported by a second pipe roll 16 provided with trunnions 17 mounted in bearings 19, which are adjustably mounted on the side frames 1 and 1a, for the purpose of adjusting the tension of the apron 15.

Upon referring to Fig. 2 of the drawings,

- it will be noted that the roll 12 occupies a position in a horizontal plane considerably below that of the roll 16.

Intermediate the rolls 12 and 16, I provide my improved coating table 20 over which the apron 15 passes, the web w1 also passing over the table 20 in contact with the upper surface of the apron 1 5. The web :v1 passes from the apron 15 onto a perforated belt 21, rotatably supported von rollers 23 and 24 suitably mounted on the frames 1 and 1a.

Intermediate the rolls 23 and 24, I provide a vacuumbox 25 which produces a suction through the perforations of that portion of the belt 21 immediately overlying the vacuum box 2 5. The `Web m1, in passing from the apron 15, lies in contact with the upper run 'of the belt 21, and by means o f the vacuum box 25 is maintained in substantially rigid contact with the belt 21. i

The coating material is applied to the web v which is maintained at a position partially submer ed in the material within the .tank 27, and in contact with the brush 26.

Initial spreading of the coating material is effected by means of a stationary brush 29 adjustably mounted on the side frames 1 and 1a, and immediately overlying one end of the coating table 2Q and in contact with the web of material as it passes over the chilled roll 7 and onto the apron 15.

Uniform distribution of the coating material is accomplished by means of a series of batteries .of vibrating brushes illustrated at 30, 31 and 32 of Fig. 2. In the present instance, each of the batteries 30, 31 and 32 vcomprises a seriesof brushes 35, 36 and 37.

Each of the brushes comprises bristles 38 suitably secured in a back 39. The back 39 of each of the brushes is secured to the underside of a transverse bar 40, slidably mounted.

42 are adjustably mounted in brackets 43 and 44 secured to the side frames 1 and 1a respectively. Vertical adjustment of the bearing blocks 41 and 42, within the brackets 43 and 44, is effected by means of jack-screws 45 which are provided with lock nuts 46, as shown in Figs. 2 and 3.

Pivoted at a point 47 to each of the bars 40 is a link 48, Fig. 3, whose opposite end is pivoted, at a point 49, to an arm 50 project ing from an eccentric ystrap 51 rotatably mounted on an eccentric 52. The eccentrics of each battery of brushes are each adjustably mounted in bearings 60 on the double eccentric ring 56.v The shaft 59 is provided with a head 61, by means of which the eccentric ring 56 may be revolved around the eccentric 455, from a position wherein the centre of a circle dening its outside face is coincident with the centre of the shaft 53, as one extreme position to the other extreme position wherein the said centre of the ring 56. the centre of the eccentric 55 and centre of the shaft 53 are all distant from and in lateral alignment with each other, whereby the amount of reciprocation of the various brushes may be minutely controlled and adjusted from zero to the maximum.

Each bearing block 41 is provided with a bracket 62 to which is pivoted, at 63, a link 64, the opposite end of which ispivoted at 49 to the connecting link 48 and the arm 50 on the eccentric strap 51. The link 64 is adapted to convert all rotary motion of the eccentric into a horizontal motion of the strap and its associated brush and prevent raising of the respective brush from the surface of web material undergoing treatment.

Each ofthe reciprocating brushes is provided with a lug. 65 extending laterally from each side of the bar 40 thereof and having an aperture 66 therein aligned with a threaded opening 67 in each bearing block 42. A rod 68 is secured in each of the apertures 67 and slidably extends through the respective aligned apertures 66 in the lugs 65. A spring 69 encircles each rod 68 and is confined between each of the lugs 65 and the block 42, for the purpose of absorbing any lost motion between the reciprocating elements connected with the brushes.

The coating table 20 comprises side frames 70, 70 suitabl braced by transversely extending bars 71, 71. A wooden platform 72 extends between an'd is suitably secured to the side frames 7 0, 7 and is faced with a coverin of slate 73 or other wear-resisting materia The apron 15 contacts with the slate facing 73 of the table 20 and is adapted to lic fiat thereon in its movement thereover.

The table 20 is adjustable in a substantially vertical direction with respect to the side frames 1 and 1a of the machine and for this purpose a pair of transversely extending shafts 74, 74 are provided, which are rotatively mounted in bearings 75, 75 secured to the frames 1 andla. Each shaft 74 is provided with an eccentric 76 adjacent each end thereof and engaging a block 77 secured to the under` side of the frames 70, 70. Each shaft 74 is provided with a mitre gear 78 at its end extending beyond the frame 1, and a connecting shaft 79, provided with mitre gears 80 meshing with the gears 78, 78, is rotatably mounted in bearings 81, 81 secured to the side frame 1 of the machine. A crank 82 or other suitable device is employed for rotating the shafts 74, 74, whereby the table 20, through the action of the eccentrics 76, 76, may be raised or lowered.

Any suitable means may be provided for retaining the table in its adjusted position land for the purpose of illustration I have shown a ratchet wheel 83 secured to one shaft 74, engaged by a pawl 84 pivoted to the frame 1a.

. Vertical movement of the table 20 is permitted and longitudinal and transverse movement thereof prevented by means of guide rods 123, 123 secured to the under side of the table 20 and being adapted to slide in apertured brackets 124, 124 secured to the side frames 1, 1a of the machine.

For the purposes of driving the reciprocating brushes each `of the battery drive shafts 53 is provided with a pulley 85. The pulleys 85 are respectively connected by belts 85a, 856 and 850 to drive pulleys 86, 87 and 88. The pulleys 86' and 87 are each secured to one end of a shaft 89, rotatably mounted in bearings 90 secured to the frame of the machine. The pulley 88 is secured to a shaft 91 rotatably mounted in bearings 92 secured to the frame of the machine.

On'each of the shafts 89, 89 is a second pulley 93 and on the shaft 91 is a pair of pulleys 94, 94 around each of which and each of the pulleys 93 a belt 95 passes, thereby operatively connecting the shafts 89, 89 and 91. A main pulley 96 is secured to the shaft 91 and is adapted to be operatively connected to any source of power (not shown).

A second main pulley 100 is secured to a shaft 101 rotatably mounted in bearings on the main frames of the machine and is adapted to supply power to the other elements of the machine. Secured to the shaft 101 is a sprocket wheel 102 connected by means of a sprocket chain 103 with a sprocket 104 secured to the shaft 18 whereby the belt 15 is driven. A

is connected by means of a sprocket chain 106 with a' sprocket 107 on one of the trunnions of the roller 23, whereby the perforated belt 21 is driven.

On the trunnion 14 of the pipe roller 12 is a. sprocket wheel 108 which connects by means of a sprocket chain 109 with a sprocket wheel 110 on the trunnion 9 of the chilled roller 7, a second sprocket 111 thereon being connected by a sprocket chain 112 with an input sprocket wheel 113 on a speed changing device 114, the output sprocket 115 thereof being connected by a chain 116 with a sprocket 117 on the shaft of the color roller 28. The' brush 26 is rotated through a trainof gears 119, 120 and 121, the first of which is secured to the trunnion 9 of the roller 7 and the last thereof is secured to the shaft of the brush 26.

It will be understood that the brush 26 may be adjusted with respect to the roller 7, and the coating material reservoir 27 with the color roll 28 may be adjusted with respect to the brush 26, on the main frame of the machine.

In order to maintain a definite and proper working tension on the' web of material as it'passes through the machine I provide a special mounting for the roll m of the material. The'roll is provided with a shaft 125 rotatably mounted in bearings 126 at each end thereof and each being secured to a beam 127 mounted on one of the main frames 1, 1a by means of roller bearings 128, 128. A brake drum 129 is secured to one end of the shaft 125 and is operatively engaged and partially ,encircled by a brake band 130, one end of which is adjustably secured to the beam 127, the other end thereof being pivoted to one leg of a bell crank lever 131 pivoted at 132 to the beam 127. The other leg 133 of the vbell crank lever is in the form of a wedge and is yadapted to have its angular side engaged by a roller 134 rotatably mounted on the frame 1. The opposite end of the beam 127 is provided with a gear rack 135, meshing with a pinion 136, secured to a shaft 137 rotatably mounted in the frame 1. A plain faced wheel 138 is secured to the shaft 137 and has one end of a stra'p 139 secured thereto, the strap passing around a pulley 140 and having an adjustable weight comprising removable discs 141 suspended dn its free end.

The weights 141 tend to force the supporting beams, with the roll m and the bell crank,

outward until the bell crank is engaged by the roller 134, the arm 133 thereof being depressed and thereby tightening the brake band 130 on the drum 129, retarding the rotation of the roll m and applying tension to the web m1. As the tension becomes abnormal the entire structure of beams, bell crank and roll are moved inward against the action of the weight by the pull of the web m1, and the brak'e band 130 is released-to a certain extent from the drum 129,*permitting further but restricted unwinding of the material from the roll The apparatus above described may be employed for applying various forms of coating material to various kinds of web ma terials, such, for example, as a fine clay suspended in a suitable carrying fluid and adapted to be applied to a web of paper or clth for filling the pores of the web.

Having described one embodiment of my invention in detail, various modifications thereto will inevitably present themselves to one familiar with the mechanical arts, therefore, only such limitations should be placed upon the scope of the invention as are prescribed by the appended claims, or dictated by the prior art of record.

I claim:

1. In a machine for coating web material, comprising side frames; a coating table intermediate said side frames, a distributing brush reciprocably mounted above said table; means at each end of the brush, for slidably supporting said brush; a shaft rotatably mounted at one end of the brush; an eccentric secured on said shaft; a strap on` said u eccentric; and means for operatively connecting the eccentric strap with the reciproeating brush comprising a link pivotally connected at one of its ends to the brush and at its opposite end to the eccentric strap, and a second link pivotally connected at one end to the brush supporting means and at its opposite end to the common pivot where the first said link connects to the said eccentric strap.

2. In a machine for coating web material, comprising side frames; a coating table intermediate said side frames; a plurality of distributing brushes reciprocably mounted above said table; a back bar for each brush;

- a bearing block adjacent each end of the back bar, for slidably supporting said bar; brackets on said side frames, for supporting said bearing blocks; means for adjusting the osition of said bearing'blocks in said brac ets; a shaft rotatably mounted on one of said side frames; aneccentric secured on said shaft; an eccentric strap on said eccentric; an arm on the eccentric strap; a bracket on one of the said bearing blocks; a link pivoted at one end on said bracket and at the other end on said eccentric strap arm; a. link pivoted at one end to said back bar and at the other` end to the common pivot of said first link and said eccentric strap arm.

LYNN B. CASE. 

